Process for the production of varied colorations and black shades on metals.



Ito Drawing.

- UNITE. D STATE s PATENT" f 011 i on. rumors aueus rri ROUX, or ran rs; rmnonnssronon 'ro socmm vamnmmnr rnancnrsor rears nance.

PROCESS FOR THE ?RODUGTION OF VABIED COLOBATIONS AND BLACK SHADES 0N METALS. i

Tp all whom it may concern:

Be it known that I, FRANCOIS Auous'r'n Roux, a citizen of the Republic of France, and resident of Paris, France, have invented a new and useful Process for the Production of Varied Colorations and Black Shades on Metals, which is fully set for-thin the fol sulfid are white.

' tion of molyb' ate there may be addeda certain amount of ammonium, in order to facilitatrlal.1 tlfie forzimafion of the clplored.l deosit w 'c a ua assingt ro' all {he cblors of lilie speczr m' reaches a olute black. This process is applicable not only to aluminium, but to all usual metals. In this latter case, it 'is often advantageous to add to the bath a cyanid or another alkaline salt.

The following is an example of the composition of the bath: Water, 1-,000 grams;

ammonium-molybdate, 25 grams; ammo- Sineeiflcation of letters Patent.

Application filed January 19, 1914. jSerial No. 818,063. I

The metal.

Patented May 5, 1914.

nium, 10 cubic centimeters. It is to be observed that these proportions are not wholly absolute and may be-varied on a large scale in order to obtain more or less quickly the desired result.

What I claim is:

1. The herein-described process of treating metals to, vary the shades of electrolytic deposition thereon which consists ,in im- -mersing the metal tube treated in an electrolytic bath composed of a neutral solu-- tion of ammonium-molybdate,and passing:

a current thereto as a cathode through the solution from an inert anode.

2. The herein-described rocess of treating metals to vary the sha es of electrolytic deposition thereon, which consists in immersing the metal to be treated in an electrolytic bath composed of a neutral solution of ammonium molybdate to which ammoni-um has been added, and passing a current thereto as a cathode through the solution from an inert anode.

3. The herein-described robes of treating metals to vary the sha es of electrolytic deposition thereon, which'consists in immersing the metal'to be treated in an elec- -Witness es:

EMILE Lnonn'r, .HANSON C. Coxn. 

